Seen several threads about people going overseas with their phone, in particular the recent one about the mother who took her phone on a cruise and had a few $100 worth roaming charges. How far into Canada can you go without having to worry about getting hit with roaming charges? I plan on going to the Canadian side of Niagara Falls (Horseshoe Falls) later this year. Probably won't go any further then some of the Casinos near the falls. If I leave the phone on will I get hit with some roaming charges or would I be close enough to the American towers to still pick up coverage?